LM48557 Speaker Driver

Mono, Bridge-Tied Load, Ceramic Speaker Driver with I2C Volume Control and Reset - Now Available at Digi-Key

National Semiconductor's LM48557 is a single supply, mono, ceramic speaker driver with an integrated charge-pump designed for portable devices where board space is at a premium. It features high power supply rejection ratio, allowing the device to operate in noisy environments without additional power supply conditioning. In addition, its superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.
LM48557 Datasheet